Following on from Aras Pranckevicius'
IOTD submission
from his Beyond3D Shader competition winning entry, here are images
from a few more notable entries to the competition. From left to right, top
to bottom we have:

Translucency (Daniel Vollmer)

Frost (Lukasz Wiklendt)

HDR Lighting (Marko Dolenc)

Rollercoaster (Emil Persson)

Retro (Eyal Teler)

2D Scaling (Ryan Nunn)

All demo's utilise PS2.0 Shaders in some form. And, yes, that really is
Frogger generated in shaders!

Descriptions, executables and source are all available at the Beyond3D
Shader competition results page.